Water is not an effective shield against the sun's more harmful rays.

水不能有效阻挡太阳中更有害的射线。

《牛津词典》

The most effective sunscreens protect against both UVA and UVB rays.

最有效的防晒霜既能防护紫外线A也能防护紫外线B。

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For example, heating a home using solar panels becomes much less effective if the Windows in the house are not properly insulated or treated to keep the heat in and the UV rays out.

举个例子来说，假如住宅的窗户没有进行恰当的隔热处理，或是不能在防止热量散失的同时阻挡紫外线，利用太阳电池板取暖的效力就会大大减弱。

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Shields, a Tampa Bay Rays starter, grew up believing that a pitcher with an effective pickoff move has an extra weapon at his disposal.

WSJ: Derek Jeter's Jump Throw, Adrian Beltre's One-Knee Home Run, Robinson Cano's Cross-Body Throw, James Shields's Crouching Pickoff Move: Baseball's Signature Moves